University of Oulu

Patrick N. Lemougna, A. Nzeukou, B. Aziwo, A.B. Tchamba, Kai-tuo Wang, U. Chinje Melo, Xue-min Cui, Effect of slag on the improvement of setting time and compressive strength of low reactive volcanic ash geopolymers synthetized at room temperature, Materials Chemistry and Physics, Volume 239, 2020, 122077, ISSN 0254-0584,

Effect of slag on the improvement of setting time and compressive strength of low reactive volcanic ash geopolymers synthetized at room temperature

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Author: Lemougna, Patrick N.1,2; Nzeukou, A.1; Aziwo, B.1;
Organizations: 1Local Materials Promotion Authority, MINRESI/ MIPROMALO, P.O. Box 2396, Yaounde, Cameroon
2Faculty of Technology, Fibre and Particle Engineering Unit, PO Box 4300, 90014, University of Oulu, Finland
3School of Chemistry and Chemical Engineering and Guangxi Key Lab of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China
4Laboratory of Applied Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaoundé, Cameroon
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 4.7 MB)
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Language: English
Published: Elsevier, 2020
Publish Date: 2021-08-28


This paper presents an investigation on the effect of ground granulated blast furnace slag on the geopolymerization of low reactive volcanic ash. Volcanic ash was blended up to 50 wt% with slag at 10% intervals. The fresh geopolymer samples were cured at 25 and 60 °C for 3, 7 and 28 days. XRD, FTIR, TG and SEM were used for phases analysis. The results outlined that only 10 wt% of slag was enough to reduce the initial setting time of the geopolymer from more than 7 days to couple of hours (6.7 h). At 25 °C, the 28 days compressive strength increased with the addition of slag in the system until an optimum value of about 85 MPA. This strength development was suggested to arise from a synergetic formation of C-A-S-H/N-A-S-H gel. At 60 °C, curing for periods longer than 7 days was not beneficial for strength development. These results are of interest for the valorization of low reactive volcanic ashes in the development of structural geopolymers, with related environmental and socioeconomic benefits.

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Series: Materials chemistry and physics
ISSN: 0254-0584
ISSN-E: 1879-3312
ISSN-L: 0254-0584
Volume: 239
Issue: 1
Pages: 1 - 8
Article number: 122077
DOI: 10.1016/j.matchemphys.2019.122077
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
215 Chemical engineering
218 Environmental engineering
Funding: This work was supported by the Chinese Natural Science Fund (grant: 51262002, 21566006 and 51561135012). PLN is also acknowledging the Postdoctoral Project from the Fibre and Particle Engineering Research Unit, University of Oulu, Finland.
Copyright information: © 2019 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license